Authors
Yi Ping, Chuanjiao Wang, Changan Hou, Zhenfeng Shang, Danhong Wang
Published in
Materials horizons. Apr 07, 2025. Epub Apr 07, 2025.
Abstract
Biomimetic synthesis via MOF-based catalysts to construct a Z-scheme heterojunction provides opportunities for enhancement of visible light photocatalytic CO2 reduction efficiency. Herein, a TiOF2@PCN-222-Fe heterojunction was designed using the L-cysteine agglomerant to simulate the structure of cytochrome c oxidase. L-cysteine axially coordinated with Fe3+ in the ferroporphyrin moiety of PCN-222-Fe through the -SH group and coordinated with Ti4+ in TiOF2 through the -COOH group. This heterojunction enhances photocurrent and conductivity, thus improving CO2 visible light photocatalytic activity. Various characterization methods including EXAFS and theoretical calculations demonstrated that the band bending of TiOF2 and PCN-222-Fe occurred through L-cysteine coordination and a Z-scheme heterojunction was formed to efficiently separate photogenerated carriers. Thus, TiOF2 accumulates electrons and acts as the active center of CO2 reduction, PCN-222-Fe accumulates holes and acts as the active center of water oxidation, and L-cysteine provides the transmission pathway of protons. The introduction of F element in TiOF2 lowered the valence band, which produced energetic holes that transferred to the valence band of PCN-222-Fe for water oxidation. This strategy provides unique insights into improving the efficiency of CO2 visible light photoreduction by biomimetic design of Z-scheme heterojunctions.
PMID:
40193062
Bibliographic data and abstract were imported from PubMed on 07 Apr 2025.
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